2024 Volume 63 Issue 4 Pages 232-238
本研究は前報の回収調査に続くもので , 産業現場からのガス溶断器具の回収調査と測定について , 圧力 調整器を対象に調べた . その 2 では圧力調整器を分解し , 入口フィルターとダイヤフラムの劣化状況を測 定した . 測定の結果 , 回収した酸素用圧力調整器の入口フィルターに粉やパッキンの繊維くずなどが見ら れた . ダイヤフラムは年数とともに硬さを増すことがわかった . 硬さを増すとともにクラックが生じやす くなる . 実験結果より酸素用とアセチレン用の測定までの年数と硬さ ( デュロメータ , タイプ A:HDA 値 ) の関係式を求め , 経年劣化が HDA 値で評価できることがわかった .
This study continues with previously reported flame arresters, gas cutting torches, and pressure regulators collected from industrial sites. In Part 1 of the previous paper, appearance and pressure fluctuation during the gas (air)supply were measured without disassembling the main body of the pressure regulators. In Part 2, the pressure regulators were disassembled, and the inlet filters and diaphragms were examined from the viewpoint of aged deterioration. The inlet filters of the collected OX pressure regulators had attached powder of something and plastic fibers. It was found that the diaphragms became harder with time, and cracks were more likely to occur. The relationship between the number of years until measurement and the hardness (durometer, type A: HDA value)of oxygen and acetylene diaphragms was determined from the experimental results. It was also found that the aged deterioration can be evaluated using the HDA value.